#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int gcd(int a, int b)
{
	if (b == 0)
	{
		return a;
	}
	else
	{
		return gcd(b, a % b);
	}
}
int main()
{
	int a, b;
	scanf("%d %d", &a, &b);
	printf("%d\n", gcd(a, b));
	return 0;
}